+ protected String headToString() { return head==null?null:head.toString(); }
+ protected String headToJava() {
+ // FIXME
+ if (head==null) return null;
+ if (head instanceof ToJava) {
+ StringBuffer sb = new StringBuffer();
+ ((ToJava)head).toJava(sb);
+ return sb.toString();
+ }
+ return (head==null?"null":("\""+StringUtil.toJavaString(head.toString())+"\""));
+ }
+ protected String left() { return "{"; }
+ protected String right() { return "}"; }
+ protected boolean ignoreSingleton() { return false; }
+
+ public GraphViz.Node toGraphViz(GraphViz gv) {
+ if (gv.hasNode(this)) return gv.createNode(this);
+ GraphViz.Node n = gv.createNode(this);
+ n.label = head()==null ? "" : head().toString();
+ //n.color = "red";
+ for(Tree t : this) n.edge(t, null);
+ return n;
+ }
+ public boolean isTransparent() { return false; }
+ public boolean isHidden() { return false; }
+
+ public static interface TreeFunctor<T,R> extends Functor<Iterable<Tree<T>>, R> {
+ }
+
+ public static class ArrayBuildingTreeFunctor<T> implements TreeFunctor<T,T[]>, ToJava {
+
+ public void toJava(StringBuffer sb) { sb.append("new Tree.ArrayBuildingTreeFunctor()"); }
+ public String toString() { return ""; }
+
+ public T[] invoke(Iterable<Tree<T>> t) {
+ ArrayList ret = new ArrayList();
+ for(Tree tc : t) {
+ if (tc.head() != null && tc.head() instanceof Functor)
+ ret.add(((Functor<Iterable<Tree>,Object>)tc.head()).invoke(tc.children()));
+ else if (tc.numChildren() == 0)
+ ret.add(tc.head());
+ else {
+ System.err.println("FIXME: don't know what to do about " + tc);
+ ret.add(null);
+ }
+ }
+ return (T[])ret.toArray(new Object[0]);
+ }